class A
{
    private int a;
    private int b;
    public A(int i, int j)
    {
        a = i;
        b = j;
    }    
    public A()
    {
        System.out.printf("-1\n");
    }
    public void show()
    {
        System.out.printf("a = %d,b = %d\n", a, b);
    }
}
class Testchoice
{
    public static void main(String[] args)
    {
        A aa1 = new A();
        A aa2 = new A(666,888);
        aa1.show();
        aa2.show();
    }
}
/*
使用构造函数时，构造函数名必须和类名相同；
*/